THIS IS THE PART 1 OF MY TRAFFIC LIGHT CONTROL SYSTEM PRESENTATION

1. Batch 5

2. 1 question:
Tell us one major problem
that we face in our day to
day life??

3. The answer is:
TRAFFIC PROBLEM

4. The solution is:
TRAFFIC LIGHT
CONTROL
SYSTEM

5. WELL !!
THAT’S OUR TOPIC TODAY!
IMPLEMENTING TRAFFIC LIGHT CONTROL
SYSTEM

6. NEED FOR THE SYSTEM :
 Traffic lightsstoplights/ traffic lamps/ traffic signals/
signal lights/ robots/ semaphore
 signaling devices
 positioned at road intersections, pedestrian
crossings and other locations
 to control competing flows of traffic.
 Preventing accidents
 Improving safety
 Minimize travel time

7. ABOUT THE COLORS OF TRAFFIC
LIGHT CONTROL
 Traffic lights alternate the right of way of road users by
displaying lights of a standard color (red,
yellow/amber, and green)
 By using a universal color code (and a precise sequence
to enable comprehension by those who are color blind

8. PROCESSOR USED:
8085
Microprocessor

9. WHY 8085?
Sufficient memory for the given
scenario
Basic units to be interfaced are
supported by 8085
Less complicated in the aspect of
coding
Supports the necessary instruction sets
Simple and robust

10. SYSTEM:
 The normal function of traffic lights requires :
 sophisticated control and coordination to ensure that
traffic moves as smoothly and safely as possible
 and that pedestrians are protected when they cross
the roads.
 A variety of different control systems are used to
accomplish this, ranging from simple clockwork
mechanisms to sophisticated computerized control
and coordination systems that self-adjust to minimize
delay to people using the road.

11. 5v Power Supply
8085
Microprocessor
7 Segment Display
LED Display
TIMER
INPUT
DISPLAYS
WAITING TIME
OUTPUT SIGNAL
BASIC BLOCK DIAGRAM

12. BLOCK DIAGRAM:

13. DESIGN-
HARDWARE COMPONENTS:
 The traffic lights - interfaced to
Microprocessor system through buffer
 through ports of programmable peripheral
Interface 8255.
 Lights automatically switched ON/OFF in
desired sequence.
 The Interface board has works with 
parallel port of Microprocessor system.

14. HARDWARE
(2 parts)
8085 Processor based system Traffic Light Controller
Interface board

15. MICROPROCESSOR BASED SYSTEM:
8085  CPU
 Heart of the System
 Controls the traffic lights
 Works according to the program written into it
Peripherals like
EPROM: Erasable Programmable Read Only Memory
Use : External Memory to store the program

16. Keyboard and Display Interface
 IC 8279
 General Purpose keyboard display controller
 Simultaneously drives the display of a
system and interfaces a keyboard with CPU
 Alpha numeric display controlled from an
internal 16x8 RAM that stores the coded
display information.
 8 seven segment displays are required to
display the number of seconds to wait.

17. Programmable Peripheral Interface
 IC 8255
 general purpose interface device
 To interface I/ O device with CPU
 contains three independent 8 bit ports named Port A,
B and C.
 PORTS A,B,C are programmable as Input/output

18. Parallel port connector
 26 Pin
 For connecting external device [Traffic Light
Controller interface Board]

19. TRAFFIC LIGHT CONTROLLER INTERFACE
BOARD:
36 LED's
20 – Vehicle Traffic Control 16-Pedestrian Traffic Control
[Connected to 20 Port lines [Connected to some ports
of 8255 through buffer ] of 8255 through buffer]

20. The traffic light interface board  connected to Main
board using 26 core flat cables to 26-pin Port
connector.
The LED's can be switched ON/OFF in the specified
sequence by the Microprocessor.
LED Consumes less power , less heat dissipation
,brighter display

21. TIMER IC:
 IC 8253
 Programmable Interval Timers (PIT’s)
 16 bit counters
 3 in number
 Independent of each other
- responsible for taking the start_timer
- Time Parameter value to properly time the traffic light
controller.

22. SIMULATION SOFTWARES:
 Open source Neil’s Simulator
 Azhar Microprocessor Simulator

23. SOFTWARE DESIGN:
STATE DIAGRAM:

24. IC’S USED:
8085 Micro processor
8255 PPI
8253 Timer
8279 Keyboard and Display Interface

25. PROPOSED SYSTEM:

26. Controlling traffic:

27. SIGNAL FOR VEHICLE

28. SIGNAL FOR PEDESTRIAN

29. FINAL PRODUCT:

30. REFERENCES:
 rbinnovations.com
 gobookee.net
 seminarprojects.com
 eprlabs.blogspot.com

31. BATCH MEMBERS
DINESH .S (11I309)
MARIA JERIN .J (11I324)
SARATHY .K (11I340)
SRINIVASAN .R (11I347)
SUBASH .S (11I348)
MURALI KRISHNAN .P (12I469)